He actually turns out to be a good bro later on. Although yes his introduction is crap and he treats Rudeus like Crap, until he realizes he is very close friend with the Elf who is also Slyphe's grandma.
>people hating on based Cliff
This was just stupidly included by the Author - it adds extremely little to the series, and if anything it makes Cliff look worse for falling for Eris like that.
I mean it certainly doesn't add anything that we didn't already know about Eris. It also doesn't impact any other character. So what's the point?
Wasn't it Rudeous who caught her during the act at the hotel, though? At least that's what it looked like from the spoiler Robo left in the comments for chapter 53. She also looks quite bored on page 17.
poor bastard keeps falling for the MC's girls...dude must've used up all his lifetime's allowance of luck getting mere standard tier genius magic skills and semi-decent looks